prevent coverage results from being submitted to coveralls if when the
build fails

Tests are skipped due to reliance on deprecated mutan

Based on https://github.com/daaku/go.travis/blob/master/install

Conflicts:
	p2p/messenger_test.go
	trie/trie_test.go

* Don't expand mem on empty value
* Removed all coinbase logs for PV42
* Removed C++ bug stuff for LOG*

* Removed (buged) C++ specific gas specification for LOG*
* Fixed LOG* where mstart went after msize
*

obscuren/mutan is deprecated